Branch always showing default, even when running on non default branch

[pierrexp9]

Describe the bug
In the message, the Branch always shows "Default", even if the build is on another branch than master

To Reproduce
Enable notifications
Launch a build
Read the notification on discord

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
configuration

notification

Environment:

• OS: Linux
• Dist: Docker
• Shell: Bash

Additional context
I use three build features
Performance Monitor
SSH agent
Report change status to GitHub

Also, when I click on the link, it gives me the correct build report, and in the report parameters, I see the correct branch name in teamcity.build.branch
and teamcity.build.branch.is_default is marked as false.